5.26.2 was in the most recent Stable update, though. 
But of course, in order to get those updates, you have to comment out the following section again in your /etc/pacman.conf…
(For those who simply ignored the plasma group)
IgnoreGrp = plasma
(For those who installed a local repository for 5.24.7)
[plasma-lts] # ← new section
Server=file:///var/cache/pacman/plasma-lts # ← new section
SigLevel = Optional TrustAll # ← new section